... held quick tester designed to easily COP (Coil-On-Plug) Ignition System Quick Tester SV750The Coil On Plug (COP) Quick Ignition tester ... tester works by receiving a signal from the secondary ignition coil. Once the signal is received, the tester determines if the ... plug, or incorrect gap Damaged/corroded wires or connectors Faulty coil or PCM Green LED lightConsistent and steady flashing indicates the ...